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Importance of environmental and biological drivers in the presence and space use of a reef-associated shark

机译：与礁石相关的鲨鱼的存在和空间利用中环境和生物驱动因素的重要性

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摘要

As coral reef ecosystems come under increasing pressure from fisheries and climate change, understanding how species that rely on these habitats respond to changes within their environment is increasingly important. The presence and movement of 28 grey reef sharks Car-charhinus amblyrhynchos were monitored for 15 mo in the southern Great Barrier Reef in relation to environmental conditions and biological factors. Twenty-eight models including water temperature, atmospheric pressure, wind speed, rainfall and time (week or month), size and sex were tested against presence and activity space data and compared using Akaike information criterion (AIC). Model results for presence of individuals in relation to environmental conditions indicated that temperature and wind speed had weak effects, likely related to detectability. Models using 3 different measures of activity space indicated no relationship between shark activity space and environmental parameters. Week was a significant factor in the top performing activity space models, with males showing increased activity space during weeks in September, when mating is believed to occur. These results suggest changes in movement were biologically rather than environmentally driven. It appears that C. amblyrhynchos are adapted to a wide range of environmental conditions in coral reef habitats and that movement between or away from reef platforms is likely related to biological factors such as prey density, competition, reproduction or dispersal rather than environmental or seasonal changes.
机译：随着珊瑚礁生态系统承受着来自渔业和气候变化的越来越大的压力，了解依赖这些栖息地的物种如何应对其环境内的变化就变得越来越重要。根据环境条件和生物学因素，在大堡礁南部监测了28条灰礁鲨Car-charhinus amblyrhynchos的存在和运动，监测了15个月。根据存在和活动空间数据对包括水温，大气压力，风速，降雨量和时间（一周或一个月），大小和性别在内的28个模型进行了测试，并使用Akaike信息标准（AIC）进行了比较。有关环境条件的个体存在的模型结果表明，温度和风速的影响较弱，可能与可检测性有关。使用3种不同活动空间度量的模型表明，鲨鱼活动空间与环境参数之间没有关系。在表现最佳的活动空间模型中，每周是一个重要因素，在九月份的几周内，雄性显示活动空间增加，而人们认为这种情况会发生。这些结果表明运动的变化是生物驱动的，而不是环境驱动的。看来，C。amblyrhynchos适应了珊瑚礁栖息地的各种环境条件，而在礁平台之间或远离礁平台的移动很可能与生物因素有关，例如猎物密度，竞争，繁殖或扩散，而不是环境或季节变化。

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  • 来源
    《Marine ecology progress series》 |2014年第27期|47-57|共11页
  • 作者

    M. R. Heupel; C. A. Simpfendorfer;

  • 作者单位

    Australian Institute of Marine Science, PMB No 3, Townsville, Queensland 4810, Australia,Centre for Sustainable Tropical Fisheries and Aquaculture and School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia;

    Centre for Sustainable Tropical Fisheries and Aquaculture and School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carcharhinus amblyrhynchos; Acoustic monitoring; AATAMS; Coral reef;

    机译：char鱼（Carcharhinus amblyrhynchos）;声学监测;AATAMS;珊瑚礁;

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